Incineration is one of the most important methods of municipal waste disposal. During incineration, various reactions of composition and decomposition may occur; the physical and chemical properties of municipal wastes may change to a great extent. In the present study, 15 samples, including food scraps (FS), animal wastes (AW) and sewage sludges (SS) were collected from various places in Japan, incineration treatments at 500°C, 850°C and 1000°C were conducted in laboratory, and pH, EC, P content, various P forms, anions and soluble metals were determined. The results indicated that average pH increased by 1.09, 1.84, 2.27 and EC decreased by 4.6, 4.6, 5.6 ds m-1 at 500°C, 850°C, 1000°C, respectively, pH increased in the sequence of AM > SS > FS, and the decrease rate of EC was in the order of FS > SS > AM. Compared with no treatment (NT), water-soluble P decreased greatly at all three temperatures; available P increased at 500°C, but decreased to the original level at 850°C and 1000°C; the amount of Ca-P, Fe-P and Al-P decreased and residual insoluble P increased greatly at 850°C and 1000°C; no significant change of total P was found at all three temperatures. However, water-soluble HPO42- and Cl- decreased greatly, the decrease ratio of Cl- was in the sequence of SS > FS > AM at 500°C, and FS > SS > AM at 850°C and 1000°C; no significant difference was found for HPO42- among all three treatment temperatures; water-soluble SO42- decreased at 1000°C, but there was no significant change at 500°C and 850°C. Moreover, water-soluble Na, Mg, K, Ti, Mn, Fe, Ga, Cd, Zn, Ba, Pb, Sr, W and 0.1 M HNO3 soluble Al, K, Cr, Mn, Fe, Zn, Sr, Ba, Pb, Be, Ga, Rb, Cd, Sn, Sb, Ta, Tl, Bi, Na, Co, Ni, Sc, Cs decreased, but water-soluble Ca, Cr, Co, Ni and 0.1 M HNO3 soluble Cu, Ca, V, Mo, W, Th, U, Hf increased at 500°C, 850°C or 1000°C.
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